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[Bug 1855573] [NEW] HDR merge fails with transparent areas in output image

To: hugin-devs@xxxxxxxxxxxxxxxxxxx
From: Torbjörn Rathsman <milasudril@xxxxxxxxx>
Date: Sun, 08 Dec 2019 08:41:16 -0000
Reply-to: Bug 1855573 <1855573@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Input: linear images in exr format
Output options: Enable LDR and HDR.

The image actually exposes two bugs: When input images are linear, then
a result encoded as TIFF is linear but GIMP treats it as sRGB (minor,
could also be a bug in GIMP 2.10).

The HDR image has strange gaps in it, so there is something that does
not work properly when merging into a HDR image. It does not matter if
internal or enblend is used as blender.

Hugin version: 2018.0.0.5abfb4de7961

# hugin project file
#hugin_ptoversion 2
p f8 w21988 h12284 v213  E0.0259287 R1 S1233,20508,328,5556 n"TIFF_m c:LZW r:CROP"
m g1 i0 f0 m2 p0.00784314

# image lines
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v37.4515047379333 Ra0 Rb0 Rc0 Rd0 Re0 Eev-0.024275124954031 Er1 Eb1 r0.233640495122331 p30.5236270424175 y-77.3336259964399 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a0 b0 c0 d0 e0 g0 t0 Va1 Vb0 Vc0 Vd0 Vx0 Vy0  Vm5 Rt1 n"_0001.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.00228790610853611 Er0.939798909386195 Eb0.939727178250528 r-0.123243207601004 p31.4631504978952 y-0.294553378035553 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0007.exr"
#-hugin  cropFactor=2.4 disabled
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.0117108818213471 Er0.93383711499805 Eb0.933967846060622 r0.162608073803688 p30.6671282929367 y-64.2429429405111 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0002.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.0238283935039408 Er0.872542594383657 Eb0.872614336236638 r0.0535587548963141 p30.6895580954147 y-51.8336459756949 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0003.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.0217707154040701 Er0.879650667987351 Eb0.879739849953266 r0.139810627268288 p30.8142287412979 y-38.8124716781733 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0004.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.00052340973387284 Er0.93199401397876 Eb0.932280029250223 r0.127298944048104 p30.9542435736608 y-26.4133016567543 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0005.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0944552782405129 Er0.980376100903011 Eb0.9805974315884 r0.129670750254606 p32.6277273343871 y63.315115378291 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0012.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.013590189402509 Er0.938484148228228 Eb0.938654095922136 r-0.16721328954283 p31.1677736172437 y-13.1223044795521 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0006.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0466660441643736 Er0.972175440373587 Eb0.972117108262507 r-0.023362101738665 p31.7461443711372 y12.1522761129797 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0008.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.087648285957064 Er0.996206139129296 Eb0.996459073768565 r-0.0740323560412443 p31.9417872078567 y25.4022880903042 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0009.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0696410750640571 Er0.992764556293737 Eb0.993106642747248 r0.0137444012197982 p32.1548974444404 y38.0025200679112 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0010.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0773596796401308 Er0.978313188916881 Eb0.978658057182005 r0.845921634841383 p32.7101484177967 y75.5825153589079 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0013.exr"
#-hugin  cropFactor=2.4
i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0582422236078531 Er0.969408631056947 Eb0.969555950954589 r-0.458917658453934 p32.3912035793726 y50.2401746800174 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0011.exr"


# specify variables that should be optimized
v v0
v Eev0
v Eev1
v r1
v p1
v y1
v Eev2
v r2
v p2
v y2
v Eev3
v r3
v p3
v y3
v Eev4
v r4
v p4
v y4
v Eev5
v r5
v p5
v y5
v Eev6
v r6
v p6
v y6
v Eev7
v r7
v p7
v y7
v Eev8
v r8
v p8
v y8
v Eev9
v r9
v p9
v y9
v Eev10
v r10
v p10
v y10
v Eev11
v r11
v p11
v y11
v Eev12
v r12
v p12
v y12
v


# control points
c n0 N2 x3885 y5233 X2403 Y5301 t0
c n0 N2 x3592.23100268931 y5263.57780951087 X2133 Y5323 t0
c n0 N2 x2317 y5432 X859 Y5438 t0
c n2 N3 x3597 y5156 X2217 Y5200 t0
c n2 N3 x3221.00001414824 y5239.00001956726 X1849 Y5268 t0
c n2 N3 x2749 y5249 X1395 Y5255 t0
c n2 N3 x2402 y5302 X1037 Y5296 t0
c n3 N4 x2217 y5199 X797 Y5195 t0
c n3 N4 x1962 y5283 X521 Y5268 t0
c n3 N4 x1849 y5268 X405 Y5251 t0
c n3 N4 x2468 y5166 X1054 Y5173 t0
c n4 N5 x2635 y5338 X1272 Y5357 t0
c n4 N5 x1773 y5234 X400 Y5214 t0
c n4 N5 x2763 y5321 X1402 Y5345 t0
c n4 N5 x2885 y5315 X1523 Y5342 t0
c n4 N5 x2991 y5319 X1625 Y5351 t0
c n4 N5 x3819 y5226 X2422 Y5294 t0
c n4 N5 x3753 y5283 X2356 Y5338 t0
c n5 N7 x2423 y5290 X951 Y5299 t0
c n5 N7 x2507 y5173 X1054 Y5184 t0
c n5 N7 x3211 y5047 X1765 Y5097 t0
c n5 N7 x3580 y5022 X2114 Y5095 t0
c n5 N7 x2166 y5302 X685 Y5301 t0
c n5 N7 x2109 y5346 X624 Y5342 t0
c n7 N1 x1750 y5097 X338 Y5081 t0
c n7 N1 x2114 y5095 X724 Y5098 t0
c n7 N1 x2552 y5338 X1147 Y5364 t0
c n7 N1 x3397 y5186 X1993 Y5247 t0
c n7 N1 x3090 y5075 X1704 Y5127 t0
c n7 N1 x2854 y5121 X1468 Y5159 t0
c n1 N8 x1466 y5160 X76 Y5139 t0
c n1 N8 x2222 y5113 X881 Y5120 t0
c n1 N8 x3107 y4837 X1792 Y4890 t0
c n1 N8 x3756 y4850 X2411 Y4940 t0
c n8 N9 x1510 y4923 X59 Y4872 t0
c n8 N9 x1790 y4890 X376 Y4855 t0
c n8 N9 x2426 y4952 X1019 Y4956 t0
c n8 N9 x2768 y4942 X1357 Y4967 t0
c n8 N9 x3664 y4649 X2254 Y4734 t0
c n9 N10 x3897 y5177 X2488 Y5244 t0
c n9 N10 x3800 y5052 X2418 Y5134 t0
c n9 N10 x2253 y4733 X938 Y4737 t0
c n9 N10 x1791 y4726 X466 Y4692 t0
c n10 N12 x2638 y4952 X1340 Y4974 t0
c n10 N12 x3087 y5068 X1770 Y5110 t0
c n10 N12 x3542 y4528 X2249 Y4617 t0
c n10 N12 x3361 y4636 X2074 Y4708 t0
c n10 N12 x3677 y4553 X2373 Y4648 t0
c n10 N12 x3940 y4665 X2593 Y4782 t0
c n12 N6 x3759 y4663 X2384 Y4756 t0
c n12 N6 x3841 y5190 X2403 Y5257 t0
c n12 N6 x3512 y5185 X2104 Y5240 t0
c n12 N6 x3210 y5247 X1805 Y5289 t0
c n12 N6 x2925 y5143 X1546 Y5173 t0
c n12 N6 x2773 y5047 X1394 Y5072 t0
c n12 N6 x2594 y4782 X1274 Y4807 t0
c n6 N11 x2382 y4758 X1131 Y4764 t0
c n6 N11 x2402 y5255 X1098 Y5269 t0
c n6 N11 x2102 y5241 X793 Y5241 t0
c n6 N11 x1803 y5289 X479 Y5279 t0
c n6 N11 x1624 y5284 X285 Y5271 t0
c n6 N11 x2829 y5221 X1494 Y5245 t0
c n6 N11 x3290 y5299 X1955 Y5340 t0

#hugin_optimizeReferenceImage 0
#hugin_blender internal
#hugin_remapper nona
#hugin_enblendOptions 
#hugin_enfuseOptions 
#hugin_hdrmergeOptions -m avg -c
#hugin_verdandiOptions --seam=blend
#hugin_outputLDRBlended true
#hugin_outputLDRLayers false
#hugin_outputLDRExposureRemapped false
#hugin_outputLDRExposureLayers false
#hugin_outputLDRExposureBlended false
#hugin_outputLDRStacks false
#hugin_outputLDRExposureLayersFused false
#hugin_outputHDRBlended true
#hugin_outputHDRLayers false
#hugin_outputHDRStacks false
#hugin_outputLayersCompression LZW
#hugin_outputImageType tif
#hugin_outputImageTypeCompression LZW
#hugin_outputJPEGQuality 90
#hugin_outputImageTypeHDR tif
#hugin_outputImageTypeHDRCompression DEFLATE
#hugin_outputStacksMinOverlap 0.7
#hugin_outputLayersExposureDiff 0.5
#hugin_optimizerMasterSwitch 6
#hugin_optimizerPhotoMasterSwitch 0

** Affects: hugin
     Importance: Undecided
         Status: New

** Attachment added: "Image illustrating bugs."
   https://bugs.launchpad.net/bugs/1855573/+attachment/5310650/+files/comparison.jpg

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https://bugs.launchpad.net/bugs/1855573

Title:
  HDR merge fails with transparent areas in output image

Status in Hugin:
  New

Bug description:
  Input: linear images in exr format
  Output options: Enable LDR and HDR.

  The image actually exposes two bugs: When input images are linear,
  then a result encoded as TIFF is linear but GIMP treats it as sRGB
  (minor, could also be a bug in GIMP 2.10).

  The HDR image has strange gaps in it, so there is something that does
  not work properly when merging into a HDR image. It does not matter if
  internal or enblend is used as blender.

  Hugin version: 2018.0.0.5abfb4de7961

  # hugin project file
  #hugin_ptoversion 2
  p f8 w21988 h12284 v213  E0.0259287 R1 S1233,20508,328,5556 n"TIFF_m c:LZW r:CROP"
  m g1 i0 f0 m2 p0.00784314

  # image lines
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v37.4515047379333 Ra0 Rb0 Rc0 Rd0 Re0 Eev-0.024275124954031 Er1 Eb1 r0.233640495122331 p30.5236270424175 y-77.3336259964399 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a0 b0 c0 d0 e0 g0 t0 Va1 Vb0 Vc0 Vd0 Vx0 Vy0  Vm5 Rt1 n"_0001.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.00228790610853611 Er0.939798909386195 Eb0.939727178250528 r-0.123243207601004 p31.4631504978952 y-0.294553378035553 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0007.exr"
  #-hugin  cropFactor=2.4 disabled
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.0117108818213471 Er0.93383711499805 Eb0.933967846060622 r0.162608073803688 p30.6671282929367 y-64.2429429405111 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0002.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.0238283935039408 Er0.872542594383657 Eb0.872614336236638 r0.0535587548963141 p30.6895580954147 y-51.8336459756949 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0003.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.0217707154040701 Er0.879650667987351 Eb0.879739849953266 r0.139810627268288 p30.8142287412979 y-38.8124716781733 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0004.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.00052340973387284 Er0.93199401397876 Eb0.932280029250223 r0.127298944048104 p30.9542435736608 y-26.4133016567543 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0005.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0944552782405129 Er0.980376100903011 Eb0.9805974315884 r0.129670750254606 p32.6277273343871 y63.315115378291 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0012.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev-0.013590189402509 Er0.938484148228228 Eb0.938654095922136 r-0.16721328954283 p31.1677736172437 y-13.1223044795521 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0006.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0466660441643736 Er0.972175440373587 Eb0.972117108262507 r-0.023362101738665 p31.7461443711372 y12.1522761129797 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0008.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.087648285957064 Er0.996206139129296 Eb0.996459073768565 r-0.0740323560412443 p31.9417872078567 y25.4022880903042 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0009.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0696410750640571 Er0.992764556293737 Eb0.993106642747248 r0.0137444012197982 p32.1548974444404 y38.0025200679112 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0010.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0773596796401308 Er0.978313188916881 Eb0.978658057182005 r0.845921634841383 p32.7101484177967 y75.5825153589079 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0013.exr"
  #-hugin  cropFactor=2.4
  i w4010 h6016 f0 v=0 Ra=0 Rb=0 Rc=0 Rd=0 Re=0 Eev0.0582422236078531 Er0.969408631056947 Eb0.969555950954589 r-0.458917658453934 p32.3912035793726 y50.2401746800174 TrX0 TrY0 TrZ0 Tpy0 Tpp0 j0 a=0 b=0 c=0 d=0 e=0 g=0 t=0 Va=0 Vb=0 Vc=0 Vd=0 Vx=0 Vy=0  Vm5 Rt1 n"_0011.exr"

  
  # specify variables that should be optimized
  v v0
  v Eev0
  v Eev1
  v r1
  v p1
  v y1
  v Eev2
  v r2
  v p2
  v y2
  v Eev3
  v r3
  v p3
  v y3
  v Eev4
  v r4
  v p4
  v y4
  v Eev5
  v r5
  v p5
  v y5
  v Eev6
  v r6
  v p6
  v y6
  v Eev7
  v r7
  v p7
  v y7
  v Eev8
  v r8
  v p8
  v y8
  v Eev9
  v r9
  v p9
  v y9
  v Eev10
  v r10
  v p10
  v y10
  v Eev11
  v r11
  v p11
  v y11
  v Eev12
  v r12
  v p12
  v y12
  v

  
  # control points
  c n0 N2 x3885 y5233 X2403 Y5301 t0
  c n0 N2 x3592.23100268931 y5263.57780951087 X2133 Y5323 t0
  c n0 N2 x2317 y5432 X859 Y5438 t0
  c n2 N3 x3597 y5156 X2217 Y5200 t0
  c n2 N3 x3221.00001414824 y5239.00001956726 X1849 Y5268 t0
  c n2 N3 x2749 y5249 X1395 Y5255 t0
  c n2 N3 x2402 y5302 X1037 Y5296 t0
  c n3 N4 x2217 y5199 X797 Y5195 t0
  c n3 N4 x1962 y5283 X521 Y5268 t0
  c n3 N4 x1849 y5268 X405 Y5251 t0
  c n3 N4 x2468 y5166 X1054 Y5173 t0
  c n4 N5 x2635 y5338 X1272 Y5357 t0
  c n4 N5 x1773 y5234 X400 Y5214 t0
  c n4 N5 x2763 y5321 X1402 Y5345 t0
  c n4 N5 x2885 y5315 X1523 Y5342 t0
  c n4 N5 x2991 y5319 X1625 Y5351 t0
  c n4 N5 x3819 y5226 X2422 Y5294 t0
  c n4 N5 x3753 y5283 X2356 Y5338 t0
  c n5 N7 x2423 y5290 X951 Y5299 t0
  c n5 N7 x2507 y5173 X1054 Y5184 t0
  c n5 N7 x3211 y5047 X1765 Y5097 t0
  c n5 N7 x3580 y5022 X2114 Y5095 t0
  c n5 N7 x2166 y5302 X685 Y5301 t0
  c n5 N7 x2109 y5346 X624 Y5342 t0
  c n7 N1 x1750 y5097 X338 Y5081 t0
  c n7 N1 x2114 y5095 X724 Y5098 t0
  c n7 N1 x2552 y5338 X1147 Y5364 t0
  c n7 N1 x3397 y5186 X1993 Y5247 t0
  c n7 N1 x3090 y5075 X1704 Y5127 t0
  c n7 N1 x2854 y5121 X1468 Y5159 t0
  c n1 N8 x1466 y5160 X76 Y5139 t0
  c n1 N8 x2222 y5113 X881 Y5120 t0
  c n1 N8 x3107 y4837 X1792 Y4890 t0
  c n1 N8 x3756 y4850 X2411 Y4940 t0
  c n8 N9 x1510 y4923 X59 Y4872 t0
  c n8 N9 x1790 y4890 X376 Y4855 t0
  c n8 N9 x2426 y4952 X1019 Y4956 t0
  c n8 N9 x2768 y4942 X1357 Y4967 t0
  c n8 N9 x3664 y4649 X2254 Y4734 t0
  c n9 N10 x3897 y5177 X2488 Y5244 t0
  c n9 N10 x3800 y5052 X2418 Y5134 t0
  c n9 N10 x2253 y4733 X938 Y4737 t0
  c n9 N10 x1791 y4726 X466 Y4692 t0
  c n10 N12 x2638 y4952 X1340 Y4974 t0
  c n10 N12 x3087 y5068 X1770 Y5110 t0
  c n10 N12 x3542 y4528 X2249 Y4617 t0
  c n10 N12 x3361 y4636 X2074 Y4708 t0
  c n10 N12 x3677 y4553 X2373 Y4648 t0
  c n10 N12 x3940 y4665 X2593 Y4782 t0
  c n12 N6 x3759 y4663 X2384 Y4756 t0
  c n12 N6 x3841 y5190 X2403 Y5257 t0
  c n12 N6 x3512 y5185 X2104 Y5240 t0
  c n12 N6 x3210 y5247 X1805 Y5289 t0
  c n12 N6 x2925 y5143 X1546 Y5173 t0
  c n12 N6 x2773 y5047 X1394 Y5072 t0
  c n12 N6 x2594 y4782 X1274 Y4807 t0
  c n6 N11 x2382 y4758 X1131 Y4764 t0
  c n6 N11 x2402 y5255 X1098 Y5269 t0
  c n6 N11 x2102 y5241 X793 Y5241 t0
  c n6 N11 x1803 y5289 X479 Y5279 t0
  c n6 N11 x1624 y5284 X285 Y5271 t0
  c n6 N11 x2829 y5221 X1494 Y5245 t0
  c n6 N11 x3290 y5299 X1955 Y5340 t0

  #hugin_optimizeReferenceImage 0
  #hugin_blender internal
  #hugin_remapper nona
  #hugin_enblendOptions 
  #hugin_enfuseOptions 
  #hugin_hdrmergeOptions -m avg -c
  #hugin_verdandiOptions --seam=blend
  #hugin_outputLDRBlended true
  #hugin_outputLDRLayers false
  #hugin_outputLDRExposureRemapped false
  #hugin_outputLDRExposureLayers false
  #hugin_outputLDRExposureBlended false
  #hugin_outputLDRStacks false
  #hugin_outputLDRExposureLayersFused false
  #hugin_outputHDRBlended true
  #hugin_outputHDRLayers false
  #hugin_outputHDRStacks false
  #hugin_outputLayersCompression LZW
  #hugin_outputImageType tif
  #hugin_outputImageTypeCompression LZW
  #hugin_outputJPEGQuality 90
  #hugin_outputImageTypeHDR tif
  #hugin_outputImageTypeHDRCompression DEFLATE
  #hugin_outputStacksMinOverlap 0.7
  #hugin_outputLayersExposureDiff 0.5
  #hugin_optimizerMasterSwitch 6
  #hugin_optimizerPhotoMasterSwitch 0

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Follow ups

[Bug 1855573] Re: HDR merge fails with transparent areas in output image
From: tmodes, 2019-12-08